Cooling fin

ABSTRACT

A cooling fin provides at least a projection part and at least a slot is disposed at lateral sides for the airflow producing turbulent flows while passing through the slot and creating eddy currents at the periphery of the cooling fin. Therefore, the cold air, which flows between a plurality of cooling fins, can stagnate longer time for carrying more heat outward and enhancing the heat dissipation efficiency greatly.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention is related to a cooling fin and particularly to acooling fin, which is capable of increasing turbulent currents andcarrying out a great deal of heat source.

2. Brief Description of the Related Art

The processing speed of the electronic chip increases due to incessantlyprogress of technology but it leads to increase of the generated heat aswell. Nevertheless, the high temperature is a primary reason of theundesirable operation efficiency and burn-out of the chip. Therefore,how to dissipate the heat from the chip for protecting the chip is oneof the subjects that are researched and developed currently.

In order to obtain the best effect of heat dissipation and promote theheat dissipation efficiency, most researches and developments are focuson the increased conductive area for the heat transmitted by the heatsink and the fan mounted to the heat sink for forcing the airflow.Besides, a plurality of cooling fins being stacked as a cooling fin setin association with guide heat pipes is utilized to promote the heatdissipation efficiency. The respective cooling fin has a flat platemember with two opposite bent edges for engaging with each other. Whenthe fan induces the air to pass through the cooling fin set, the airflowmoves fast and it is able to carry a small amount of heat on the cooingfin set only. Hence, the effect of heat dissipation is still limitedalthough it was designed for expecting the good heat transfer with theeffective heat dissipation.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, an object of thepresent invention is to provide a cooling fin, which get involve theconcept of turbulent flow for increasing the stagnation time of the airstaying at the respective cooling fin of the cooling fin set andenhancing the efficiency of heat dissipation greatly in addition toincrease the area of the heat dissipation.

Accordingly, A cooling fin according to the present invention comprisesat least a projection part and a slot, which is disposed at the lateralsides, for turning the airflow into the turbulent flow while the airflow passing through the slot and for creating eddy currents at theperiphery of the cooling fin. Therefore, the cold air, which flowsbetween a plurality of cooling fins, can stagnate longer time forcarrying more heat outward and enhancing the heat dissipation efficiencygreatly.

Wherein, the protrusion part can be circular or the square shape.Further, a plurality of the protrusion parts can be arranged irregularlyon the plate member such that the effect of different eddy currents atthe periphery of the cooling fin can be produced advantageously and theslots at the lateral sides of the respective protrusion part are helpfulfor increasing the coefficient of heat exchange of the cooling fin andenhancing the integral performance of the cooling fin.

BRIEF DESCRIPTION OF THE DRAWINGS

The detail structure, the applied principle, the function and theeffectiveness of the present invention can be more fully understood withreference to the following description and accompanying drawings, inwhich:

FIG. 1 is a perspective view of a cooling fin according to a preferredembodiment of the present invention;

FIG. 2 is an fragmentary perspective view of the cooling fin shown inFIG. 1 illustrating the square protrusion part;

FIG. 3 is a perspective view of a cooling fin according to anotherembodiment of the present invention; and

FIG. 4 is a fragmentary perspective view of the cooling fin shown inFIG. 3 illustrating the circular protrusion part.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIGS. 1 and 2, a cooling fin 10 according to the firstpreferred embodiment of the present invention basically is a platemember 1 with a bent edge 11 at two opposite lateral sides. The bentedge 11 can be provided with an engaging part for joining two platemembers 1. At least a protrusion part 12 is provided on the plate member1 and the protrusion part 12 is square shape with a slot 121 or aplurality of slots 121 being disposed at each of the lateral sidesthereof for guiding the airflows such that the airflows can be turnedinto the turbulent flows to surround the plate member 1. In this way,the stagnation time of the airflow can be extended to carry more heatoutward for enhancing heat dissipation.

Besides, the projection parts 12 can be arranged irregularly at thecooling fin 10 such that the effect resulting from different eddycurrents at the periphery of the cooling fin and the slots 121 at thelateral sides of the respective projection part 12 can promote thecoefficient of heat exchange of the cooling fin 10 to enhance theintegral performance of the cooling fin 10.

Referring to FIGS. 3 and 4, another embodiment of a cooling fin for aheat sink according to the present invention is illustrated. Similarly,the cooling fin 10 of the second embodiment basically is a plate member1 with a bent edge 11 at two opposite lateral sides thereof. The bentedge 11 can be provided with an engaging part for joining two platemembers 1. At least a protrusion part 12 is provided on the plate member1 and the protrusion part 12 is square shape with a slot 121 or aplurality of slots 121 being disposed at each of the lateral sidesthereof for guiding the airflows such that the airflows can be turnedinto the turbulent flows to surround the plate member 1. The differenceof the respective projection 12 from that shown in FIGS. 1 and 2 is inthat the shape of the respective projection 12 is circular instead ofsquare. In this way, the stagnation time of the airflow can be extendedto carry more heat outward for enhancing heat dissipation as well.

While the invention has been described with referencing to the preferredembodiments thereof, it is to be understood that modifications orvariations may be easily made without departing from the spirit of thisinvention, which is defined by the appended claims.

1. A cooling fin comprising: a plate member with a bent edge at twoopposite sides thereof; and at least a projection part being irregularlyarranged at said plate member; wherein, each of said lateral sides ofprojection part has at least a slot available for being passed throughwith an airflow.
 2. The cooling fin as defined in claim 1, wherein saidprojection is square-shaped, circular-shaped or any shapes.
 3. Thecooling fin as defined in claim 1, wherein said slot surrounds saidlateral sides continuously or discretely.